Lighting fixture



11, 1966 E. F. ZURAWSKI ETAL 3,228,545

LIGHTING FIXTURE 4 Sheets-Sheet 1 Filed Jan. 24, 1963 W INVENTORS.

z/ma )/awr0 I C /fiZ-AQ M Maw Qfibamegar Jan. 11, 1966 E. F. ZURAWSKIETAL 3, 8,645

LIGHTING FIXTURE 4 Sheets-Sheet 2 Filed Jan. 24, 1963 44 16 R\ vs W mixa 0 2 W 2 m7 jwfia%ww@ 2T 5 k, a g i/ ,9, 4 m Z M a Z/ .4 3 n; W

1966 E. F. ZURAWSKI ETAL 3,228,645

LIGHTING FIXTURE 4 Sheets-Sheet 5 Filed Jan. 24, 1963 INVENTORS.

C/Mv" aim'zeya Jan. 11, 1966 E. F. ZURAWSKI ETAL 3,228,645

LIGHTING FIXTURE Filed Jan. 24, 1963 4 Sheets-Sheet 4 INVEN T0115dwm/vzgm/msv United States Patent C) 3,228,645 LIGHTING FIXTURE EdwardF. Zurawski and Frank Schram, Chicago, Ill., assignors to GareyCorporation, a corporation of Illinois Filed Jan. 24, 1963, Ser. No.253,664 5 Claims. (Cl. 248-343) This invention relates to a lightingfixture, and is particularly concerned with a fixture having an outerframe that is installed as a unit in an opening in the ceiling duringthe regular construction of a building, and a reflector that isinstalled as a unit in the outer frame after the construction work isfinished and the interior of the building is clean.

Both sides of the outer frame are provided with a bracket near each endof the frame for mounting the outer frame in an opening providedtherefor in the ceiling. The brackets are held in retracted position bylatches each of which has a lip projecting outwardly from its lower end.When the outer frame is pushed upwardly into the opening in the ceiling,the outwardly projecting lips engage the edges of the ceiling definingthe opening and release the latches automatically. The brackets arespring pressed and move outwardly, upon release of the latches, toengage the beams or support members mounted on top of the ceiling. Thesupport members are made in different configurations by differentmanufacturers of building hardware, and the lower edge of the bracketsmay be shaped to fit any specific support.

After the outer frame is in position, with the brackets resting on thetop surface of the beams or similar support members, it is tightenedinto its final position by means of adjusting screws that are accessiblefrom below the frame. In the final position of the outer frame itsbottom surface is preferably approximately flush with the lower surfaceof the ceiling. The outer frame has a slot at eachend. The heating andventilating contractor can work through the opening in the outer frameto place an air diffuser box over each of the slots at opposite ends ofthe outer frame. One diffuser box is connected to a cold air duct totransmit cold air to the room in which the fixture is installed. Thecold air diffuser box is provided with fiber glass insulation on theside opposite the intake so that the cold air doesnt get warmed by thewarm air in the plenum. The other slot allows the warm air to flow fromthe room in which the fixture is installed to the plenum. The diffuserbox mounted above the warm air slot limits the amount of warm air thatis returned to the plenum and also helps to insulate the fixture againsttransmission of sound.

The outer frame of the fixture is also provided with an electricalsocket that is wired to a circuit provided therefor. When the reflectoris mounted in the outer frame it is hinged on the side of the outerframe having the electrical socket so that it can swing pivotally aboutsaid one side, and is latched to the opposite side of the outer frame.The outer frame is provided on three of its edges with a gasket offoamed polyethylene, rubber, or any other suitable material to preventtransmission of sound when the fixture is closed. The hinged side of thereflector is provided with an electrical plug that fits into the socketon the outer frame when the reflector is swung upwardly into its normalposition of use. The reflector unit is energized when it is swungupwardly into its normal position of use, and is de-energized when itslatch is released and the reflector is swung downwardly about itspivotal connection with the outer frame.

The construction of the outer frame that permits the reflector to bemounted at any time after the outer frame has been secured in place hasseveral advantages. During the construction Work the reflector unit maybe proice tected against the dust and dirt incidental to such work. Thereflector unit may remain in its protective wrapping until the interiorof the building is substantially clean. Then, when the reflector unit isunwrapped and mounted in the outer frame it is clean, and may be usedwithout any extra cleaning job. If the reflector is mounted in the outerframe at the time the outer frame is secured to the ceiling, subsequentdirt from the construction work would make it necesary to clean thereflector before it could be used.

The structure of the present invention has another advantage in that itenables the contractor to save expense during the construction of abuilding. In building practices heretofore used, the unions haveinsisted that a member of the heating and ventilating workers unioninstall the air diffuser boxes on the fixture. Then, after installationof the fixture by a member of the electrical workers union, a member ofthe heating and ventilating workers union was required to connect thecold air diffuser box to the cold air duct. In the installation of afixture constructed in accordance with the present invention, thediffuser boxes are not installed on the fixture until the outer frame ofthe fixture is mounted in the ceiling. When the cold air diffuser box isinstalled on the outer frame of the fixture it may be connected to thecold air duct by the same workman as an additional step in the sameoperation.

For maintenance, the reflector may be removed from the outer frame as aunit and replaced with a reflector unit in good condition. The replacedreflector unit may then be serviced or repaired at the leisure of themaintenance man. Thus, when a light goes out, persons working in theroom dont have to wait while the maintenance man determines whether thebulb has burned out or whether the trouble is somewhere else. Theremoval of the reflector unit also provides access to the plenum for thewiring or for any other purpose. A reflector unit may also be removedfor replacement by a reflector unit having a different number of bulbstherein.

Suitable structure by means of which the above mentioned and otheradvantages may be attained will be fully described in the followingspecification, taken in conjunction with the accompanying drawingsshowing a preferred embodiment of the invention, in which:

FIGURE 1 is a bottom plan view of a fixture embodying the invention asit is installed in the ceiling of a room;

FIG. 2 is a fragmentary perspective view of the outer frame ready formovement upwardly through an opening in the ceiling;

FIG. 3 is a diagrammatic side elevational view showing the outer frameas it is moving upwardly into the opening before the latches holding themounting brackets have been released;

FIG. 4 is a view, similar to FIG. 3, immediately after release of thebracket holding latches;

FIG. 5 is a view similar to FIG. 4, after the outer frame is lowered tocause the mounting brackets to rest on the supporting members;

FIG. 6 is a view similar to FIG. 3, after the adjusting screws have beentightened to secure the outer frame against the ceiling;

FIG. 7 is an enlarged fragmentary cross sectional view showing thelatched side of the reflector secured to the outer frame, and onemounting bracket seated on a beam;

FIG. 8 is a view similar to FIG. 7, but showing the hinged side of thereflector secured to the outer frame;

FIG. 9 is a fragmentary detail sectional view showing the adjustingscrew and the spring pressed inner end of the mounting bracket;

FIG. 10 is a cross sectional View, taken along the line 10-10 of FIG. 9;

FIG. 11 is an enlarged. lognitudinal sectional view, taken along theline 1111 of FIG. 1;

FIG. 12 is an enlarged fragmentary cross sectional view, taken along theline 12-12 of FIG. 11;

FIG. 13 is a cross sectional view, taken along the line 13-13 of FIG. 7,showing the mounting bracket in its latched position in dot and dashlines;

F IG. l4 is a fragmentary side elevational view, showing one form of'mounting bracket in latched position against the side of the outerframe;

FIG. 15 is a view, similar to FIG. 14, showing a differentform ofmounting bracket;

FIG. 16 is a fragmentary end view, partly in elevation and partly insection, showing the mounting bracket supported on one form ofsupporting member; and

FIG. 17 is a view, similar to FIG. 16, showing the mounting bracketsupported on a different form of supporting member.

Referring to the drawings, the lighting fixture comprises an outer frame2,'and a reflector 3 detachably pivoted to the outer frame. A dilfuserpanel 4 may be secured to the fixture in any suitable manner. The outerframe is mounted within an opening5 provided therefor in a ceiling 6.The ceiling may be of any suitable construction, but for illustrativepurposes has been shown as having hangers 7 depending therefrom tosupport panels 8 of a drop ceiling; A plurality of beams 9 extend alongthe top of ceiling 6 to support the outer frame. Mounting brackets 10extend outwardly from the outer frame, as hereinafter described, toengage the upper surface of beams 9 and thereby support the outer frame.The outer frame also has a base 11 in the form of a hollow flatrectangle. The outer edges of base 11 are bent upwardly to form flanges12 adapted to engage the bottom surface of panels 8 when the outer frameis in place.

A housing13 is mounted on base 11 near each end of the outer frame. Eachhousing 13 has two relatively short side walls 14 and 15 supported onbase 11 and connected by an end wall 16 integral therewith. The upperedge of end wall 16 is bent over to form a top flange 17approximatelyflush with the upper edges of sidewalls 14 and 15. Thelower edge of end wall 16 is bent at right angles in the oppositedirection to form a flange 18 that terminates in spaced relationship tothe inner edge of base 11 to form a slot 19. A similar slot 20 is formedat the opposite end of the outer frame by identical structure. At eachend of the outer frame an L-shaped member 21 has a horizontal leg 22welded to base 11 and a vertical'leg 23 extending upwardly therefrom.Vertical leg 23 comprises an end section 24 and two side sections 25extending from the outer ends of section 24 to end wall 16 of housing13. Vertical leg 23 cooperates with end wall 16 to form an open topenclosure surrounding slot 19," and a similar enclosure surrounds slot20 at the opposite end of the outer frame. End section 25 of eachvertical leg23 abuts the edge of adjacent panels 8 when the outer frameis mounted in the ceiling.

A longitudinally extending bracket 26 has its oppositeends secured toside walls 14 adjacent opposite ends of the outer frame, and a similarbracket 27 has its opposite ends secured to side walls 15. The upperedge of bracket 26 is bent inwardly to form a horizontal section 28,upwardly to form a vertical section 29, and then inwardly to formanother horizontal section 30. Although the bending is described as astep by step operation for the sake of clarity, it will be understoodthat ordinarily the three bending operations are performedsimultaneously. Bracket 27 is similarly bent to form a horizontalsection 31, a vertical section 32 and a horizontal section 33.

Mounting brackets 10 adjacent each corner of the outer frame are eachmounted in the same manner, so only one will be described. Each mountingbracket 10 comprises a flat section 34 latched in place on the outsideof side wall 14 or 15, and another flat section 35 extending at rightangles to flat section 34. Side walls 14 and 15 are 4 each provided witha vertical slot 36 having a length substantially greater than the heightof section 35 of supportingbracket 10. Section 35 extends through slot36, as shown in FIG. 10. As shown best in FIG. 9, a channel 37 extendsat right angles to section 35 and is secured to its outer edges.

Channel 37 comprises a web 38 having a centrally disposed opening 39 anda pair of flanges 4t) and 41 having aligned openings 42 and 43,respectively. An adjusting screw 44 extends through section 28 ofbracket 26, through both openings 43 and 42, and through top flange 17of housing 13. Screw 44 has a slotted head 45 adjacent the lower surfaceof section 28. The slotted screw head is accessible from below the outerframe so that if the outer frame does not fit snugly against the ceilingwhen support brackets 10 rest on beams 9, the screw may be turned toposition the outer frame properly.

A square nut 46, threaded on screw 44 between flanges 40 and 41, has onecorn-er 47 extending through opening 39 to prevent vertical movement ofthe nut when the screw is turned. The screw cannot move channel 37because of the clearance at both openings 42 and 43. Since nut 46 isfixed in its vertical position, notation of screw 44 causes the screw tomove vertically relative to the nut, and the screw carries outer frame 2with it. After the outer frame is moved into opening 5, screw 44 isrotated in one direction to move flange 12 into tight engagement withceiling panel 8.

A torsion spring 48, coiled around screw 44, has one end 49 biasedagainst end wall 16 of housing 13 and its other end 50 biased againstthe inner surface of web 38 of channel 37. The spring extends throughopening 39 in web 38. Since mounting bracket 10 is secured to channel37, the pressure of spring 48 constantly urges the mounting bracketoutwardly from side wall 14 or 15.

Before installation of the outer frame, mounting bracket 10 is held inretracted position against side Wall 14 or 15 by a slidable latch bar51, as shown in FIG. 2. A plurality of oppositely disposed lugs 52struck out from side wall 14 or 15 fit against opposite edges of latchbar 51 with sufficient friction to hold the latch bar in place. Theupper end 53 of the latch bar is offset and overlies the outer end ofmounting bracket 10 to hold it in retracted position against side wall14 or 15 against the action of torsion spring 48. Latch bar 51 is alsooffset, as indicated at 53' in vertically spaced relationship to upperend 53, so that mounting brackets 10 may be mounted at a lower level, ifdesired. The lower end of latch bar 51 is bent outwardly at right anglesto provide a lip 54 spaced above base 11.

When the outer frame is to be installed, it is held in verticalalignment with an opening 5 in the ceiling and is then pushed upwardlyinto the opening. As the outer frame is pushed upwardly into opening 5,each lip 54 moves into engagement with the underside of a ceiling panel8. Continued upward movement of the outer frame causes supportingbracket 11) to move upwardly out of engagement with upper end 53 oflatch bar 51. As soon as supporting bracket 10 clears the upper end oflatch bar 51, spring 48 moves the support-ing bracket rotational 1yabout the screw 44 until it extends outwardly at right angles to itsretracted position. The rotational movement of supporting bracket 10 isstopped by engagement of the supporting bracket with one side of slot36. When the supporting brackets 10 are moved outwardly from theirretracted positions they must be high enough for each bracket to clearthe beam or other similar member on which it is to be supported. Theeffective length of latch bar 51 may be varied to release the supportingbracket at any desired position of the outer frame. After the supportingbrackets have been moved from their retracted positions, the outer frameis dropped so that the supporting brackets rest on the beams or othersupports. The adjusting screws are then tightened to move the outerframe into tight engagement with the ceiling.

As shown in FIG. 7, the lower edge of section 34 is shaped to provide ahorizontal portion 55 adapted to rest on a beam having a horizontal topsurface. An adjacent portion of the lower edge of section 34 is providedwith a recess 56 that adapts the bracket arm to rest on supportingmembers of various cross sectional shapes. For example, in FIG. 16 thesupporting bracket is mounted on a cylindrical pipe 57,-and in FIG. 17,the support member 58 has a tapered edge 59 fitting in the semi-circularrecess 56. Section 34 also has an aperture 60 so that the outer framemay be supported by wires depending from an upper support. FIG. shows asupporting bracket 61 having a lower edge that is straight except for anoffset 62 at its outer edge. The lower edge of the supporting bracketmay have any suitable shape to fit any desired support member.

Base 11 of the outer frame has the shape of a hollow rectangle, with acentrally disposed opening having its sides defined by the inner edgesof brackets 26 and 27, and its ends defined by housings 13. At each endof outer frame 2 the L-shaped member 21 co-operates with housing 13 todefine an open top enclosure that surrounds slot 19 at one end of theouter frame and slot at the other end. After the outer frame isinstalled in the ceiling opening, an air diffuser box 63 is placed inthe enclosure surrounding slot 19, and an air diffuser box 64 is placedin the enclosure surrounding slot 20. Diffuser boxes 63 and 64 may beduplicates, but preferably box 63 is designed to allow warm or exhaustair to flow fro-m the room in which the fixture is installed into theplenum, and box 64 is designed to allow cool air to flow into the roomfrom a cold air duct. Each end of the outer frame is provided withmounting members 21 to hold the diffuser boxes against accidentaldisplacement.

The structure of the outer frame permits a substantial economy in thecost of installing the fixture. Union rules generally permitinstallation and connection of air diffuser boxes only by workmen whoare members of a heating and ventilating union, and installation andconnection of the fixture only by workmen who are members of anelectrical union. Combination lighting and ventilating fixturespreviously installed required a heating and ventilating union worker toinstall the air diffuser boxes in the fixture prior to installation ofthe fixture, t-hen installation of the fixture by an electrical unionworker, and finally connection of at least one air diffuser box to theair duct after installation of the fixture. Wit-h the structure of thepresent invention, the heating and ventilating union worker does nothave to make two separate trips to the job. The centrally disposedopening in the outer frame permits the heating and ventilating unionworker to install and connect the air diffuser boxes after the fixturehas been installed.

Air diffuser box 63 has a slot 65 that registers with slot 19 when thebox is positioned in its enclosure. Diffuser box 64 has a slot 67 thatregisters with slot 20, and an inlet opening having a flange 68 thatfits into a cold air duct 69. Diffuser box 64 preferably has fiber glassor similar insulation (not shown) on the side thereof opposite the inletto prevent the cold air from being warmed by the Warm air in the plenum.Both diffuser boxes help insulate the room against transmission ofsound.

Reflector 3 is detachably secured to the outer frame after the outerframe is installed and the interior of the building is substantiallyclean. The reflector comprises a flat top wall 70 extendingsubstantially the length of the outer frame and two side sections 71 and72 that extend angularly downwardly. The outer edges of side sections 71and 72 are bent to form horizontal sections 73 and 74, respectively, andthen bent upwardly to form angular flanges 75 and 76, respectively.Channel members 77, secured to top wall 70 adjacent each end of thereflector, support sockets 78 in which fluorescent tubes 79 are mounted.A gasket 80 secured to the upper surface of top wall 70 adjacent eachend extends across the top wall,

side section 71 and a portion of horizontal section 73. Gaskets 81 and82, preferably of the same material as gasket 80, are secured to theupper surfaces of sections 73 and 74 respectively, and extendlongitudinally along said sections.

The portions of gaskets above top wall 70 are clamped between it and thetop flanges 17 of the adjacent housings 13. The portion of gasket 80extending over side section 77 is clamped against said side section bymeans of tongues 83 bent inwardly from each end wall 16, as shown inFIG. 7. Gasket 81 is clamped between sections 30 and 73, and gasket 82is similarly clamped between sections 33 and 74. When the reflector ismounted in the outer frame, gaskets 80, 81 and 82 co-operate to insulatethe fixture against transmission of sound.

A latch 84 is pivotally secured to the under side of section 73, asshown at 85 in FIG. 12, adjacent each end of the reflector. Latch 84 isprovided with a finger piece 86 to facilitate rotation. When latch 84 isturned transversely of the fixture it extends through a. slot 87 betweensections 28 and 29 of bracket 26 to releasably support one side of thereflector.

The opposite side of the reflector is supported by a pair of bingestrips 88. Each hinge strip 88 is an integral member comprising anangularly disposed section 89 and a horizontal section 90 that extendsthrough a slot 91 at the juncture between sections 72 and 74. Flange 76is also slotted, as indicated at 92, and section 32 is slotted, asindicated at 93, to permit the end 94 to rest on the top surface ofsection 31. End 94 is offset, as indicated at 95, to provide stabilityfor the hinge. When latch 84 is released and reflector 3 is allowed toswing downwardly about its pivot, offset 95 co-operates with theupstanding portion of section 32 below slot 93 to keep the reflectorfrom sliding out of its pivotal connection.

As shown in FIG. 8, a housing 99 mounted on the inner surface of sidewall 15 of one housing 13 on the outer frame has one wall 100 spacedfrom and inclined at an angle to side wall 15. An electrical soclcet 96is mounted within housing 99 but has its outer face projecting throughan opening in wall 100. The portion of socket 96 within housing 99 iswired, by means of leads 101 and 102, to a suitable source of electricalcurrent. The outer face of socket 96 is parallel to wall 100. Anextension 98 secured to side wall 72 of reflector 3 has one wall 103spaced from and parallel to wall 100. A plug 97, mounted in extension98, is wired to the fluorescent tubes 79 and has its outer endprojecting through wall 103 in parallel relationship thereto. Plug 97has prongs (not shown) adapted to fit into recesses provided therefor inthe outer face of socket 96 when reflector 3 is swung upwardly intoengagement with the outer frame.

When reflector 3 is latched in place in the outer frame, the lightingcircuit is energized, and when it is swung downwardly about its pivot,the lighting circuit is deenergized. Thus, the reflector may be removedfrom the fixture without bothering about the wiring, and anybodyswinging the reflector down to replace a fluorescent tube will know thatthe lighting circuit is de-energized.

Although we have described a preferred embodiment of the invention inconsiderable detail it will be understood that the description thereofis intended to be illustrative, rather than restrictive, as many detailsof construction may be modified or changed without departing from thespirit or scope of the invention. Accordingly we do not desire to berestricted to the exact structure described.

We claim:

1. A lighting fixture adapted to be installed in a ceiling, said fixturecomprising a base member and a pair of housings forming an outer frame,each of said housings being spaced from the adjacent end of said basemember to provide a support for an air diffuser box, an air diffuser boxmounted on each of said supports, a plurality of brackets mounted onsaid outer frame, latch means for holding said brackets in retractedposition against the sides of said outer frame, means for releasing saidlatch means, and means for moving said brackets outwardly from saidretracted position upon release of said latch means, whereby saidbrackets may engage a support surface spaced outwardly from said outerframe to hold said outer frame against movement downwardly relative tosaid support surface, said base member having an Opening between saidhousings to provide access to each of said air diffuser boxes afterinstallation of said fixture in a ceiling.

2. A lighting fixture adapted to be installed in a ceiling, said fixturecomprising an outer frame, said outer frame including a pair of housingsand a base extending longitudinally beyond the remote ends of saidhousings, an air diffuser box supported on said base outwardly of theremote end of each of said housings, an air flow passageway extendingthrough the bottom of each air diffuser box, a slot in said base inregistration with each of said aid flow passageways, a plurality ofbrackets pivotally mounted on said outer frame, latch means for holdingsaid brackets in retracted position against the sides of said 'outerframe, spring means urging each of said brackets pivotally outwardlyfrom said retracted position, and means for releasing said latch means,whereby said brackets may swing outwardly and engage a support surfacespaced outwardly from said outer frame to hold said outer frame againstmovement downwardly relative to said support surface, said base havingan opening between said housings to provide access to each of said airdiffuser boxes after installation of said fixture in a ceiling.

3. A lighting fixture comprising an outer frame adapted to be installedin a ceiling, said outer frame having a centrally disposed openingtherein, a plurality of brackets mounted on said outer frame, latchmeans for holding said brackets in retracted position against the sidesof said outer frame, means for releasing said latch means, means formoving said brackets outwardly from said retracted position upon releaseof said latch means, whereby said brackets may engage a support surfacespaced outwardly from said outer frame to hold said outer frame againstmovement downwardly relative to said support surface, said openingproviding access through said outer frame, after installation thereof ina ceiling, for workmen to install and connect accessories above theceiling at either end of said frame, and means integral with said framefor detachably securing a reflector adapted to extend across saidopening.

4. In combination with a ceiling, a lighting fixture comprising an outerframe having a lateral flange extending outwardly from each edge of saidframe, said ceiling having an opening to receive said frame with saidflanges underlying the edges of said ceiling defining said opening,means on said outer frame for clamping it in place with said flangesapproximately flush with the lower surface of said ceiling, and means onsaid outer frame for detachably securing a refiector thereto.

5. In combination with a ceiling, a lighting fixture comprising an outerframe having a lateral flange extending outwardly from each edge of saidframe, said ceiling having an opening to receive said frame with saidflanges underlying the edges of said ceiling defining said opening,support members secured above said ceiling on opposite sides of saidopening, means on said outer frame engageable with said support membersfor suspending said outer frame from said support members, means on saidouter frame for moving said outer frame upwardly relative to said firstmentioned means to force said flanges against the underside of saidceiling and to hold said outer frame in said last mentioned position,said outer frame having a centrally disposed opening to provide accessthrough said outer frame to space above said ceiling after installationof said fixture in said ceiling, and means integral with said outerframe for detachably pivotally securing a reflector thereto.

References Cited by the Examiner UNITED STATES PATENTS 2,614,785 10/1952Versen 248343 2,744,716 5/1956 Zingone 248318 2,801,019 7/1957 De Ronck220-3.6 2,839,672 6/1958 Bobrick 240147 2,927,295 3/1960 Sitz 339-182,973,177 2/1961 Stubbs 248--343 3,004,235 10/1961 Cohen 339-183,018,082 1/1962 Berger 248343 3,018,083 1/1962 Bobrick 248343 3,018,3631/1962 Gibson et al. 240147 3,065,686 11/1962 Geocaris 94-40 3,097,8007/1963 Schwartz 24078 CLAUDE A. LE ROY, Primary Examiner.

EMILE G. ANDERSON, Examiner.

1. A LIGHTING FIXTURE ADAPTED TO BE INSTALLED IN A CEILING, SAID FIXTURECOMPRISING A BASE MEMBER AND A PAIR OF HOUSINGS FORMING AN OUTER FRAME,EACH OF SAID HOUSINGS BEING SPACED FROM THE ADJACENT END OF SAID BASEMEMBER TO PROVIDE A SUPPORT FOR AN AIR DIFFUSER BOX, AN AIR DIFFUSER BOXMOUNTED ON EACH OF SAID SUPPORTS, A PLURALITY OF BRACKETS MOUNTED ONSAID OUTER FRAME, LATCH MEANS FOR HOLDING SAID BRACKETS IN RETRACTEDPOSITION AGAINST THE SIDES OF SAID OUTER FRAME, MEANS FOR RELEASING SAIDLATCH MEANS, AND MEANS FOR MOVING SAID BRACKETS OURWARDLY FROM SAIDRETRACTED POSITION UPON RELEASE OF SAID LATCH MEANS, WHEREBY SAIDBRACKETS MAY ENGAGE A SUPPORT SURFACE SPACED OUTWARDLY FROM SAID OUTERFRAME TO HOLD SAID OUTER FRAME AGAINST MOVEMENT DOWNWARDLY RELATIVE TOSAID SUPPORT SURFACE, SAID BASE MEMBER HAVING AN OPENING BETWEEN SAIDHOUSINGS TO PROVIDE ACCESS TO EACH OF SAID AIR DIFFUSER BOXES AFTERINSTALLATION OF SAID FIXTURE IN A CEILING.